Question

if seven times the seventh term of an A. P is equal to eleven times the its eleventh term, then find its 18th term

Answer 1

18 th term is 0
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Answer 2

7(a+6d)=11(a+10d)
7a+42d=11a+110d
4a=-68d
a=-17d
a+17d=T18
T18=-17d+17d
      = 0